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(No Model.)

E. W. HERENDEEN.

SPRING TOOTH HARROW.

No. 359,970. Patented Mar. 22, 1887.

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UNITED STATES PATENT Urrrcs.

EDXVARD \V. HERENDEEN, OF GENEVA, NEXV YORK.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 359,970, dated Itlarch 22, 1887.

Application filed October 11, 1886. Serial No. 215,920. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD \V. HEREN- DEEN, of Geneva, in the county of Ontario and State of New York, have invented certain Improvements in Spring-Tooth Harrows, of which the following is a specification.

My invention has reference to that class of harrows in which elastic or spring teeth attached at their upper ends to a frame have their lower ends or points curved downward and forward to enter the soil. Teeth of this general character have been known in the art for many years, and have been attached to frames of various forms by a variety of fastening devices adapted to permit their adjustment.

The aims of my invention are principally to provide an improved frame and improved means for attaching the spring-teeth.

To this end it consists, essentially, in constructing the frame of metallic channel-barsthat isto say, bars having vertical flanges at their edges; in providing these flanges with openings through which the end of the tooth passes, and in combining therewith fastening devices, as hereinafter described.

In the accompanying drawings, Figure 1 represents a perspective view of a tooth attached to a frame bar or beam in accordance with my invention, the bar in this instance having depending flanges. Fig. 2 is a similar view illustrating the tooth attached to a bar with upturned flanges. Fig. 3 is a perspective view showing a section of the frame bar or beam, with the openings for the tooth therethrough and with the tootlrclamping plate in position. Fig. 4 is a perspective view of the clamping or confining plate in one ofits forms. Fig. 5 is a vertical cross sect-ion through one of the beams or frame-bars, with the tooth scoured thereto by means of a central bolt.

In carrying my invention into effect I first provide metallic channel bars or beams A, in any suitable size and number, and bolt or otherwise connect them together to produce a frame of the required form. These channelbars are preferably rolled from mild steel with a temper or hardness sufficient to give them a suitablehard ness and elasticity. Through the flanges of each bar, at suitable points in its length, I form transverse openings (4 a, of a form and in a position adapted to receive the end of the tooth B. This tooth I prefer to form in the ordinary manner represented in the drawings of a flat form in cross-section, with its upper end curved downward and rearward, whereby it is adapted to be extended through the beam from side to side and through the openings c a, as represented in Figs. 1, 2, and 3.

In harrows as ordinarily constructed the beams extend in a direction oblique to theline of travel, while the tooth is curved longitudinally in a vertical plane lying in the direction of travel. In consequence of this fact, the end of the tooth passes obliquely through the beam. This oblique position of the tooth, in connection with the curvature of the latter, renders it necessary to incline the slots a a in opposite directions from the horizontal, as shown in the several figures, this formation adapting them to receive and closely embrace the tooth,which is consequent] y held rigidly in position by the beam. The parts are so fitted that the end of the tooth may be adjusted longitudinally through the beam, in order to vary the posi tion of the point, to compensate for wear or for other purpose.

vIn order to prevent the accidental move ment of the tooth through the beam, I propose to secure the same in position therein by fastening devices of any appropriate character. I may provide the tooth with a series of holes, I), at dil'i'erent points in its length and secure it in position by a vertical bolt, 0, passing through the tooth and the beam, as represented in Fig. 5. This construction, while securing the tooth firmly in position, admits of its being adjusted longitudinally at will. I prefer to employ, however, in place of the bolt passing through the tooth, a plate bearing upon the tooth, as shown at D, and secured by bolts 0. This plate, which is fitted in the hollow side or channel of the beam, may be of any appropriate form. In Figs. 2 and 3 the plate extends entirely across the inside of the beam, bearing against the inner walls of its flanges and serving to prevent them from being accidentally bent inward. It bears upon the tooth at a single line only midway between the two flanges. Being thus applied, the plate forces the tooth firmly against the walls of the slots,

the elasticity of the toothbeing brought into play and serving to maintain a close contact with the supporting-surfaces.

In Fig. 4 Ihave illustrated a cruciform plate, the four arms of which bear against the inner faces of the flanges to assist in holding them in proper position. When this plate is used,

I prefer to form the same with the raised rib d to bear upon the tooth midway between the flanges.

It will be observed that in my structure the duction or pulverization of the soil, I prefer the construction represented in Fig. 1, the

edges of the flanges in such case serving asan eifioient aid in the reduction of the soil. It is in this connection that the use of the plates to support the flanges internally is of special advantage. In order to give increased strength and durability to the forward flange, which willreceive the greater part of the wear when the bars are used as in Fig. 1, I may form the forward flange of greater thickness than the other, as represented in Fig. 5 but it is to be understood that this is not a necessary feature of the bar.

In the event of the forward flange becoming unduly worn,bars constructed on my plan may be reversed or turned end for end, the teeth being of course changed from side to side, and thus the unworn flange brought into position at the front.

The essence of my invention resides in the employment of channel-bars the flanges of which are provided with slots or openings adapted to receive the ends of the spring-teeth and give support thereto, and it is manifest that the form and position of these openings may be modified as circumstances may require or fancy dictate without passing beyond thelimits of my invention.

Having thus described my invention, what I claim is- 1. In a springtooth harrow, the combination. of the elastic tooth, the metallic channel.-

bar provided in its flanges with openings through which the end of the tooth is passed, and a fastening device, substantially as de scribed, applied within the bar to secure the tooth in place.

2. Achannel-bar and an elastic barrow-tooth seated in its two flanges, in eombinationwith a fastening device, as described, acting upon the tooth midway between the flanges only,

whereby the tooth is held to its bearingswitha an elastic or yielding pressure.

3. In aharrow,the metallic channel-bar provided in its respective flanges with slots inclined in opposite directions, as described, whereby it is adapted to receive and hold a curved obliquely-placed tooth.

In testimony whereof I hereunto set my hand in the presence of two attesting witnesses.

EDWARD w. HERENDEEN.

Witnesses:

S. A. TERRY, J. A. ROLLINGS. 

